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-rw-r--r--fs/fscache/internal.h1
-rw-r--r--fs/fscache/object.c23
-rw-r--r--fs/fscache/operation.c13
3 files changed, 28 insertions, 9 deletions
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index c81179303930..dcb3e1d5dbf6 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -288,6 +288,7 @@ extern const struct file_operations fscache_stats_fops;
static inline void fscache_raise_event(struct fscache_object *object,
unsigned event)
{
+ BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS);
if (!test_and_set_bit(event, &object->events) &&
test_bit(event, &object->event_mask))
fscache_enqueue_object(object);
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 2ef8a082a272..2c512cbac380 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -103,6 +103,7 @@ static void fscache_object_state_machine(struct fscache_object *object)
{
enum fscache_object_state new_state;
struct fscache_cookie *cookie;
+ int event;
ASSERT(object != NULL);
@@ -275,7 +276,8 @@ static void fscache_object_state_machine(struct fscache_object *object)
/* determine the transition from a lookup state */
lookup_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
case FSCACHE_OBJECT_EV_RETIRE:
case FSCACHE_OBJECT_EV_RELEASE:
@@ -292,7 +294,8 @@ lookup_transit:
/* determine the transition from an active state */
active_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
case FSCACHE_OBJECT_EV_RETIRE:
case FSCACHE_OBJECT_EV_RELEASE:
@@ -314,7 +317,8 @@ active_transit:
/* determine the transition from a terminal state */
terminal_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
new_state = FSCACHE_OBJECT_WITHDRAWING;
goto change_state;
@@ -347,8 +351,8 @@ done:
unsupported_event:
printk(KERN_ERR "FS-Cache:"
- " Unsupported event %lx [mask %lx] in state %s\n",
- object->events, object->event_mask,
+ " Unsupported event %d [%lx/%lx] in state %s\n",
+ event, object->events, object->event_mask,
fscache_object_states[object->state]);
BUG();
}
@@ -945,7 +949,7 @@ static void fscache_invalidate_object(struct fscache_object *object)
spin_lock(&cookie->lock);
if (fscache_submit_exclusive_op(object, op) < 0)
- BUG();
+ goto submit_op_failed;
spin_unlock(&cookie->lock);
fscache_put_operation(op);
@@ -960,4 +964,11 @@ static void fscache_invalidate_object(struct fscache_object *object)
*/
fscache_invalidation_complete(cookie);
_leave("");
+ return;
+
+submit_op_failed:
+ spin_unlock(&cookie->lock);
+ kfree(op);
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
+ _leave(" [EIO]");
}
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index c58dbe613266..9e6b7d232bb1 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -84,6 +84,8 @@ static void fscache_run_op(struct fscache_object *object,
int fscache_submit_exclusive_op(struct fscache_object *object,
struct fscache_operation *op)
{
+ int ret;
+
_enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
@@ -116,6 +118,7 @@ int fscache_submit_exclusive_op(struct fscache_object *object,
/* need to issue a new write op after this */
clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ ret = 0;
} else if (object->state == FSCACHE_OBJECT_CREATING) {
op->object = object;
object->n_ops++;
@@ -123,13 +126,17 @@ int fscache_submit_exclusive_op(struct fscache_object *object,
atomic_inc(&op->usage);
list_add_tail(&op->pend_link, &object->pending_ops);
fscache_stat(&fscache_n_op_pend);
+ ret = 0;
} else {
- /* not allowed to submit ops in any other state */
- BUG();
+ /* If we're in any other state, there must have been an I/O
+ * error of some nature.
+ */
+ ASSERT(test_bit(FSCACHE_IOERROR, &object->cache->flags));
+ ret = -EIO;
}
spin_unlock(&object->lock);
- return 0;
+ return ret;
}
/*